Switch and fuse



May 10, 1927. 1,628,413 A. F. c. LoTz SWITCH AND FUSE Filed April 10, 1925 4 Sheets-Sheet l //Mim wf@ 3 -Mwvlww May 10,1927.

A. F. C, LOTZ SWITCH AND FUSE Filed April lo, 1925 4 Sheets-Sheet 2 w 7 71 v ,03 M0, W F i". 3 .--NH M @e A aa d 2 2/ /7 0 im.; f f w M 2 m h w 1 0l l May 10,1927. 1,628,413V

A. F. C. LOTZ swITcH AND FUSE Filed April 1o, 1925 4 sheets-sheet 5 H B/ITTERY Vllrwmllllw ffefs ,Mmmf/f@ a" ,a SM.

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' lMay y1o, 1927. 1;62s,413

A F. C. LOTZ vSWITCH AND FUSE Filed April l0, 1925 4 Sheets-Sheet 4 Patented May 10, 1927.

UNITED STATES 1,628,413 PATENT OFFICE.

ALFRED E. C. LOTZ, OF CHICAGO, ILLINOIS, ASSIGNOR TO ELECTRICAL ENGINEERS EQUIPMENT COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

SWITCH i AND FUSE.

Application filed April 10, 1925.` Serial No. 22.@027.

My invention relateal to an improved switch and tune unit` more particularly to a .switch and Vtuse unit especially adapted ttor use with radio rereivinjij instruments, aithough ot' courefe, it may be employed wherever found desirable.

ln radio work the receivinseI instrun'ient has usually been coi'itrolled by a Switch in the A batte tircuit only. 'The B kliatter57 circuit has usually been a` permanently closed circuit, because ot the relative inactivity ot that circuit when the A battery circuit open, und because ot (he extra' cost, parte` and operathine` which would have accompanied an additional switch in that circuit. Furtiaerinore, an additional switch inthe B battery circuit would neu-illy be disregarded by the ordinary operator because ot the abilit'v to control the eet. without it..

However, l find that with a. permanently eloeed li batteriT vcircuit there is a certain lore; in that circuit when the A batteryY cir ruit is open. W here this circuit: alwaye closed, there ie also alwaye.4 the possibility oit accidentalilyv Short rircnitingY it and burningr out the tubes.

"The objeete ol" my preeent invention are the provision of a generalh7 in'iiiiroved, einiplilied and inexpensive device for opening and dosing the B battery circuit.. with the o'iiening' and closing ot' the. A battery cirA ruit without an additional separate Switch in the l), battery circuit and without additional parte and. ope'ations, also e device which will zit-:eure opening` olf the B circuit ivl'ienevt-n the A circuit is opened und without the ueeeseity ot the operator reniernbering` to open it each time.

The rnviteh ol in v presaent invention ia :ulapted to secure the Aforegoing in :i eirnirile7 eiipeditious, and inexpensive manner. lt eorniiiaet. eoinprieei few parta, is easily operated., and adapted Yfor mountingh upon a, panel or otherwieie ae desired in this clans ol worli.

l also provide a novel mounting and coinliination o'l5 the tune or other protective devicey with the Switch for rotecti1'1gv the B battery eirruit, and the tube filaments.

To acquaint those skilled in the. art with the manner ot prartcingr nrv 'inventionv` l y@hall now deeeribe certain particular e1nbodh'nente` ot the invention in connection with the aeroninauyingr drawing. in which:

Figure l ie a side elevational view ot one einbodinieiit ot the invention. mounted upon a panel;

1 Dig. .Z ie' a` rear end view of the device Snown in L l:

showing' it vice. shown in Fig. 6;

liig. 8 ie a transverse section taken on line SMQ olE Fig. 9;

Fig. 9 'is a longitudinal section taken on line 5)9 ot Fig. (5;

Fig. l() is; a traneverse section on line lllw AU ot Fig. 9;

Fig. ll it 'wiring' or cireuit diagram oit' the en'ibodilnent shown in Figsi l to 5; and

liig. l2 is a circuit diagram ot the einborlinien A shown in 6 to l0.

Referring tiret to the embodiment shown in (i to l0, inclusive, l provide a Sleeve or hoilow shell. l5 which may be ot bakelite, libre, hard rubber, or the like. One oit the open ends ot 'the sleeve l5 ,is smoothiv finished, while the other end has internal thrende` which are, adapte( to co-operate with the. external threadel ot a guide nieinber I6. The ruido ineinber lo roniprisesi a lcap portion I7 which hee an annule" flange part adapted to tit over the adjacent end ot the Sleeve with its e( a tluel'i with the outer surface thereof, and a tubulz r externalljvVv threaded guide :sleeve 1S screwed into an openingV provided for it in the central portion of the can t7. The guide sleeve i8 passes through an oilieningi` provided tor it in the panei or other utqiporting ineinber lt). It is Secure-lvv held in piace in the panel by iii-earn; ot the bach nut Qi), a 'liront tinn ishing and panel in'otta:tinel plete and a Afront nut l'Jraiving-l' ot the nuts 2O and 22 together binds the switch supporting sleeve iirinlyY in place, and bv threading Said nuts both along' the sleeve the tngac-ingi` ot the switch Afrom the panel may be varied.r and the outer end of the :sleeve ina); even be extended thereby Ytroni the outer ffice ot the nut Should that be desirable. The guide sleeve lo is provided with a eentrel bore which is smoothly finiehed and serves lili as a bearing surface for the shaft Q3. The shaft 23 projects from the forward nut and carries an operating knob 2li. The knob 2i may be of bakelite, or the like, having a metallic inset and a screw 25 secures the knob rigidiy on the shaft The opposite end of the shaft A3 extends beyond the inner end of the cap member 17 and carries a cam member 26. The cam member Q6 comprises a stop portion 27 and a cam portion proper 2S. The cam portion 2S has a central opening in which the inner end of the shaft 23 is iixedly secured by a transverse pin 29.

The cam portion 28 has a pair of rela tively semi-circular ends which are joined together by a pair of relatively fiat sides. The stop portion, on the other hand, is relatively circular in shape except for a sector 28 which extends out iaterally from one side thereof and which acts as the stop proper. By turning the shaft 23 by means of the knob 2li, the cam portion Q8 actuates a pair of springs 30 and 31, which maybe of phos phor bronze or other suitable material. Each is provided with an outwardly projecting or hump portion 32 and 3B, respectively, which may limit the insertion of the cam member 26 in the sleeve l5 and properly align the parts.

rlhe spring 30 is provided at one end with an integral lateral leg or extension turned atrelatively right angles thereto, as shown in Fig. 10, this extension having` a second angular leg 35 anchored to the sleeve l5 bjv means of a contact screw 3G and nut 37. The screw 36 has electrical contact with the anchored end ot' the sp ing 30 and it may be provided with an additional nut 38 for binding the conductor which leads from the negative A battery terminal of the radio set to the terminal screw 3G. The opposite end of the spring 30 is free and seit' biased into position, spaced from the head of a contact screw 39, secured in the sleeve l5 by means of a nut 40, and adapted to have the negative A battery conductor bound thereon by means of a nut 4l, the conductor to one of the screws 89, 3G, leading` from the negative side of the A battery and the conductor from the other screw continuing on in the same line.

The spring 3l is provided with an opening intermediate its ends through which, and a similar opening` in the sleeve l5, passes the screw member d'2. fr nut 43 threads on the screw member 42 and serves to securely hold the spring 3l in position within the sleeve 15. One end of the spring 3l is bent back on itseltl to form the U portion ti, the edges of which are slightly flared upwardly, so as to receive and guide the contact portion 44C of the fuse unit The opposite end of the spring 3l is free and self 'biased into position, spaced from the head of a contact screw 46, secured in sleeve l5 by means of a nut a7, and adapted to have the negative lead of the B battery bound thereto by means of a nut 48.

A generally U-shaped spring 49, which may also be of phosphor bronze, serves to electrically connect opposite side or contact 45) of the fuse unit l-j with the Contact screw 51. The base of the spring i9 is lirmly secured to the sleeve l5 by means of a screw 5l which makes contact therewith and engages externally of the sleeve in a nut 52. The other negative B battery conductor is bound upon the screw 5l by means of a binding nut 523, the separation of the free end of the spring 3l from the contact screw 46 opening the negative side of the B battery, and the engagement of it with the screw to closing the same and connecting the protective fuse #i5 in series therewith.

In operation, the knob 24 is grasped and turned, turning with it the shaft .3 and the cam member W'ith the switch in open position, as shown in Fig. E), turning of the cam QS in the direction indicated by the arrow brings the opposite arcuate edges ot the cani into co-operation with the free ends of the contact springs 230 and 3l. and forces said springs into contact with the internal contact heads of the screws 39 and 46, respectively. This closes the negative side of the A battery through the. contact spring 3() and contact or terminal screws 39 and 3G, and simultaneously the negative side of the B battery through the contact spring 3l. screws 4() and 5l, and Vfuse or protectivr'. elenient 45.

As the springs 3() and 3l are brought into complete contact with their respective screws, one of the radial faces of the stop segment 2T comes into lateral engagement with one side edge of the spring 30 and limits or prevents further turning of the cam Q8 in this direction. By turning the cam member Q8 in the opposite direction, the opposite arcuate cam surfaces thereot disengage the springs 30 and l, permitting the free ends of said springs to separate themseivcs by their own self biasing action from contact with their respective contact screws and a6. This opens the negative side ot the A battery and simultaneously with it the negative side ot the B battery. The B battery circuit is thereby opened without an additional switch and without any additional operation. Opening of the B battery circuit is assured whenever the A battery circuitl is opened without further thought and without requiring the operator to remember to do it, and the losses heretofore incident to a. closed B battery circuit when the A battery circuit is open are avoided.

At the limit. ot the turning of the cam in its opening movement. the opposite radial face of the stop sector 27 engages one side edge `formed by making the portion 95 oit smaller diameter than 'the portion 94C. The opposite end oit the shaft 9e is enlarged at 97, and has an operating' head 98 which may bc ot' insulating material Secured thereon are by the screw 99 which threads into the end of the shaft 9T. lllhen the switch is in the otl position, the eliat't tit is as shown in Fig. Jn where it ir; .seen that the portion 9T which is adjacent; to the portion 94- bears against the outer surface ot the collar portion ot the sleeve 92.

To turn the Switch on the operatinpY element is ptr-shed axially inwardiy, cai LVing the head 9S to engage the dirergingv warped ends ot' the contact SpringeI Gti til GS and 69, and torce or spread Isame out into engagement with their respective contact screws, closing the A and l battery circuits simu-.L taneously. llllieu the switch in on'- the knob 9G may bear against the outer not ltltl which, together with the nut 1111A serve to hold the` switch by means` ot the eleere ft2 securely to the panel 102. When the operating element is pulletfl out into its outer ponitioin the contact springe Laeparate 'trom the contact screws at their tree contact endif, by thelr own seit biasingaction, and as below, when closed thc tuseit is connected in .series iu the B circuit From the wiring diagram shown in Fig; 1L considered in view o'll the above description it will be uuderetood that both sides olA both the A and i3 battery circuits are opened and closed together u ith/iut separate provisions and operations Vtor eacl 'lhe fuse unit (32 is in the negative side of the .B battery, although it may be otherwise inserted it iound desirable and* when the switch is on. this branch ot' the circuit is completed from the radio set to the negative Side ot the l battery by means ot the conductor 113, the springs GS and GSt and the conductor 114. The'conductors 115. 11G and 117 serve to connect the negative and positive A battery terminals ot the set with the switch and the positive B battery terminals o1 the set with the Switch. respecti.'ely. The conductors 110 and 111 Serve to connect the A battery with the switch, while the conductor 112 connects the positive side ot' the B battery with the switch.

I do not intend to be limited to the details shown and described.

I claim:

1. In combination, an enclosing sleeve, contact springs mounted in said sleeve and each having a terminal openingr through the sleeve, terminal contacts mounted in said sleeve for Contact with said springs, an operating element for said Contact springs, and a fuse mounted in the sleeve and connected between one contact springr and its terminal.

2. In combination, an insulatingr sleeve, means Secured iu. one end ot' the sleeve 'for mounting the san1e,'contact springs mounted within the Sleeve, terminals for said springs.A and an operating element tor said contact springs mounted in said sleeve mounting; means, said sleeve having' a Socket. with adjacent-contacts in circuit between one ot said springs and the terminal therefor auch circuit inclmlinga fuse member mounted in said socket and having contact means for engagement with adjacent first contacts.

S5. In combination, a tubular shell ot infini-ating material. a cam member adapted tor rotary movement within .said shell, the axle ot' sraid member being disposed loir gitudinally ot said shell7 a plurality ot.E .spring members actuated b v said cam member, eaid spring members beiner also dispoeed longitudinally olg said Shell and having outwardly extending hump portions l'or limiting the movement ol' said cam member inwardly of the shell.

l. In combination` a tubular shell of insulating material lutviugi a cap at one end thereof, an axially extending' lsleeve tilted iu Said :ap having' a Shaft mounted therein` a cam member at one end ot said shalt havingr a cam portion and an integral stop portion, a plurality ol spring,Y members long'itudinally mounted within said shell said stop portion beingr adapted to cooperate with said springs for limiting the rotary motion o'l said cam member.

In combination` a tubular shell ot insulating material having a plurality of spring members longitudinally mounted thereiin one end ot said spring members being generally U-shaped, a plurality of contact screws, an axially mounted cam member within said shell adapted to actuate said spring;r for bringing them into contact relation with Said contact screws, said springs being brought into contact relation with said Contact screws by being moved outwardly and away from each other by the cam member.

In witness whereof, I hereunto subscribe my name this 31st day of March, 1925.

ALFRED F. C. LO'IZ. 

